Reasons for High Low Pressure in Car AC When High Pressure is Normal

[Reid]

When the car air conditioning exhibits low low pressure and normal high pressure, it is highly likely caused by a malfunction or damage to the AC expansion valve. The solution for high low pressure and normal high pressure in car AC is quite simple: just remove the AC expansion valve and check if its working condition is normal. If it is indeed faulty or damaged, a direct replacement is sufficient. Below is extended information about car AC pressures: 1. Precautions: Since the expansion valve of the car air conditioning system is located on the vehicle's firewall side, disassembly is quite inconvenient. Additionally, temporary recovery of the AC refrigerant is required, making the task labor-intensive. Therefore, we recommend visiting a 4S shop for this service. Attempting to do it yourself may lead to the opposite effect. 2. Pressure: Under normal conditions, when the compressor operates at 1500-2000 rpm, the high pressure should be around 1.5-2.0 MPa, while the low pressure should be around 0.15-0.35 MPa.